Ive been back and forth with the idea of upgrading the CPU's in my 2010 MP, purely due to the question do i actually need to. But anyway i love playing around and building computers so i went ahead and changed the 2.4ghz E5620's to 3.46ghz x5677's. I also upgraded the RAM from 16gb to 24gb which now runs at the full 1333 thanks to the CPU's. All went smoothly and it works fine, i know these CPU's draw more power than my old ones and ive decided to use SMC to up the fan speeds slightly but im not sure what 'safe' tempertures are? At idle it was showing 35 degrees C, but whats a safe temperture under load?